I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
rattail ratal rattle rattly retail ruttily ratel rutile retile radial retally readily radiale rotl radially radialia ridley rootle retell riddle retool redial radula raddle ritual radulae reedily rowdily ruddily
coattail cattail rattail tail wittily tattily fattily cattalo cattily knottily nattily nuttily ruttily detail dottily pettily total retail chattily til
raita ratty reata riata bratty rat